GLONASS on-board time/frequency standard-architecture and operation

While being one of the main units of the Global Navigation Satellite System (GLONASS), the spaceborne time/frequency standard (STFS) determines, to a great extent, a whole number of system technical and operation performances. Among these is, first and foremost, an accuracy of satellite time synchronization against system time, as well as probability of target task solving, satellite active life and time for recovery of system integrity. This paper presents principles of STFS construction and functioning along with its main parameters.<>